[zeromq-dev] zmq_msg_send blocks reading from zmq::mailbox_t

[Marcin Romaszewicz]

Hi Guys,

We had our prod systems running on 3.2.4, and to work around some file
descriptor leaks, I'm testing 4.1.2 before back-porting jbreams' heartbeats
patch, and testing unmodified 4.1.2 is failing for me in production.

I've got ZMQ_ROUTER sockets wedged in zmq_msg_send, spinning in a while
(True) loop calling recv() on mailbox in zmq::socket_base_t::send().

Before I start chasing the cause of this, is there a known mistake on my
part which could cause this?

The socket is a ZMQ_ROUTER, with all settings at default except for
ZMQ_LINGER=0 and ZMQ_ROUTER_MANDATORY=1

I'm pretty sure I'm sending stuff to a dead peer, but not 100% certain yet.

Any tips on what I should be looking for to diagnose this? The same code,
unmodified, doesn't have this issue against zmq 3.2.4.

Thanks,
-- Marcin
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